Method for manufacturing scissors and the like



W. MULLER Nov. 7, 1967 METHOD FOR MANUFACTURING SCISSORS AND THE LIKE Filed Sept. 10, 1965 2 Sheets-Sheet 1 Mum 70R m1 ya 44 #0a a? 6 Y M Y 7 74- k Kirryx.

Nov. 7,1967 WMULLER 3,350,962

METHOD FOR MANUFACTURING SCISSORS AND THE LIKE Filed Sept. 10, 1965 2 Sheets-Sheet 2 (T/k w United States Patent ()fiice 3,359,962 Patented Nov. 7, 1967 ABSTRACT OF THE DISCLOSURE Scissors are formed by bending a handle loop that ends short of the shank. The scissors are then die pressed to shape both the blade and the loop while maintaining a gap between the loop end and the shank, after which the flash is removed.

This invention relates to scissors and like implements of the kind having two parts pivoted together each part having on one side of the pivot axis an operative portion (in the case of scissors a cutting blade or holder for a blade) and on the other side of the pivotaxis a shank formed with a looped handle. Heretofore it has been usual for the loops to be closed and this has lead to certain difliculties in manufacture.

According to this invention an implement of the kind referred to is characterised in that a part of each looped handle is formed with a split adjacent to and separating it from said shank whilst leaving another part of the handle attached to the shank.

In one form of the invention the slits in the loops are formed on those sides thereof which are near one another when the shanks are in their closed positions.

-In another form of the invention the slits are formed in those portions of the loops which are disposed outwardly of the shanks.

In either of the above arrangements, in the closed condition of the implements, the adjacent sides of the shanks and adjacent sides of the loops may be disposed close to one another. For example one side of each shank and a side of its associated loop may be straight and in line with one another.

In such an arrangement the aforesaid slit may be disposed between an end of the straight side of the loop and the end of the shank.

The above forms of looped handles avoid certain difficulties which otherwise occur when each operative portion and associated shank and looped handle are fashioned from a rod of carbon steel.

Heretofore it has been usual so to bend an end portion of the rod so that it is looped back on itself and so that its extremity is over that portion of the rod which is to form an end of the shank. The next operations have been to weld together the crossover portions of the rod and to place the blank thus formed between shaped die portions in a press which shaping is such that when the press is operated the blank is brought substantially to its finished shape apart from flash which is removed in a subsequent operation.

With this method of manufacture unless the pressing operation is carried out under elevated temperature with subsequent cooling and annealing internal stresses are set up in the locality of weld which may lead to cracks forming or at the best the metal has an unsightly appearance at the locality of weld particularly when the implement is given a finish such as by plating or gilding. One of the objects of this invention is to overcome these drawbacks.

According to this invention a method of manufacturing each of the pivoted parts of an implement of the kind referred to consists in bending one end of a metal rod to form said loop and so that the extremity of that end is disposed adjacent that part of the rod which is to form that end of the shank remote from the pivot axis, placing the blank so formed between shaped parts of a die in a press which parts are so shaped that when pressure is imparted by them to the blank it is brought substantially to the required shape of the finished article whereafter v the resulting flash is removed.

The above method may involve the use of die parts so shaped as to prevent, during the pressing operation, the metal of the extremity of the rod merging with the metal of the rod which is to form the shank.

Alternatively should the shaping of the die parts be such that the metal of the extremity of the rod merges with the metal of that part of rod which is to form the shank the subsequent operation for removing the flash is arranged also to remove said merging metal so as to form a slot of the required width between said extremity and shank.

The pressing operation may either be a hot or cold pressing operation.

As indicated above the method is particularly applicable where a carbon steel rod is employed.

The following is a description of the various stages in the manufacture of an integral scissor blade, shank and handle loop both as heretofore produced and as produced by the present invention reference being made to the accompanying drawings in which:

FIGURE 1 shows the initial rod;

FIGURE 2 shows the rod bent and welded in a manner previously produced;

FIGURE 3 shows the blank after pressing;

FIGURE 4 shows the finished article;

FIGURE 5 is a similar view to FIGURE 2 but showing how the rod is initially bent according to the present invention;

FIGURE 6 is a similar view to FIGURE 3 showing the blank after pressing the bent rod of FIGURE 5;

FIGURE 7 is a section on the line 7-7 of FIGURE 6;

FIGURE 8 shows the finished article;

FIGURE 9 is a similar view to FIGURE 5 but showing how the rod is initially bent when it is required that the aforesaid slot shall be in a different position; and

FIGURE 10 shows the finished article after pressing the rod of FIGURE 9 and removing the flash.

Referring to FIGURES 1 to 4, which illustrated the known method of forming an integral scissor blade, shank and handle loop, an initially straight rod 10 of carbon steel as depicted in FIGURE 1 is bent, by means of a suitable jig, into the shape shown in FIGURE 2.

The length of the metal on the upper side of the slight inflexion 11 is formed into the scissor blade 12 of FIG- URE 4 whereas the portion 11 forms the shank. The lower extremity of the rod is bent into the form of a loop 14 and the end portion 15 of the rod is arranged to cross the lower end of that part 11.

These portions are spot welded together at 16 and flattened by pressing or forging before being placed be tween two shaped parts of a die in a press, which die parts are shaped in accordance with the required finished shape. The press is then operated so as to cause the metal to flow into the shaped die parts. This results in flash 16 being squeezed outwardly from the blank which is removed by a shearing tool in another press.

This method, even if the rod is hot pressed, results in weakness or unsightly appearance in the .finished article in the locality 17 of the Weld.

The method according to the present invention as shown in FIGURES 5 to 8 is generally similar to that described above but the rod is initially bent into a different shape and the welding strip is eliminated. As will be seen from FIGURE 5 instead of the portion 11, which is to form the shank, continuing straight towards the lower end of the loop 14 as in the first arrangement, it is given an outward inflexion at 18 and then formed into the loop 14 so that extremity 15 of the rod comes into general line with the part 11 but a gap 19 is left between them. As before the resulting blank is placed in a two part die in a press and in this instance the die is so shaped as to prevent the metal of the extremity 1S merging with the lower end of the shank although there may be a certain amount of flash 20 between these parts which may be removed in the subsequent shearing operation. The dies are so shaped as to form a somewhat arcuate shaped slot 21 at that location.

The die parts may be so shaped that the shanks 13 are straight sided and the outer edge 21' of one side of the loop may also be straight and in line with an edge of the shank.

In the arrangement shown in FIGURES 9 and 10 the rod 10 is initially bent in a somewhat similar manner to that shown in FIGURE 2 but its extremity 15 instead of crossing the lower end of the portion 11 stops short of it and the die parts are so shaped as to form a slot 22 at that locality.

As indicated above these methods of manufacture are partciularly applicable where the rod is formed from carbon steel and where cold pressing is employed.

I claim:

1. A method of forming each of two pivoted parts for a bladed instrument having looped handles comprising bending one end of a rod to form a loop so that the extion extending away from the loop, placing the blank so formed between shaped parts of a die in a press which die parts are so shaped that when brought together pressure is imparted by them both to the loop part and to the part which is to form the blade and so that the metal at the extremity of the rod is prevented from uniting with the metal of the shank portion whereby the blade, shank and loop are brought substantially to the required shape for the finished article with a gap in the loop adjacent the shank whereafter the resulting flash is removed.

2. A method as claimed in claim 1, in which the operation for removing the flash is arranged also to remove metal which may spread into the gap so that the gap is brought to the required width.

3. A method as claimed in claim 1, in which the loop as formed prior to die pressing terminates a distance from said shank portion.

4. A method as claimed in claim 1, in which said loop extends from said shank first outwardly away from said shank and then inwardly and terminates in a portion in general alignment with said shank.

5. A method as claimed in claim 1, in which said loop extends first outwardly from said shank and then toward said blade and terminates in an inwardly directed portion that extends in a direction transverse to the length of the shank.

References Cited UNITED STATES PATENTS 7 1,407,127 2/1922 Concannon 76-104 GRANVILLE Y. CUSTER, JR., Primary Examinert 

1. A METHOD FOR FORMING EACH OF TWO PIVOTED PARTS FOR A BLADED INSTRUMENT HAVING LOOPED HANDLES COMPRISING BENDING ONE END OF A ROD TO FORM A LOOP SO THAT THE EXTREMITY OF THAT END IS DISPOSED ADJACENT TO A SHANK PORTION EXTENDING AWAY FROM THE LOOP, PLACING THE BLANK SO FORMED BETWEEN SHAPED PARTS OF A DIE IN A PRESS WHICH DIE PARTS ARE SO SHAPED THAT WHEN BROUGHT TOGETHER PRESSURE IN IMPARTED BY THEM BOTH TO THE LOOP PART AND TO THE PART WHICH IS TO FORM THE BLADE AND SO THAT THE METAL AT THE EXTREMITY OF THE ROD IS PREVENTED FROM UNITING WITH THE METAL OF THE SHANK PORTION WHEREBY THE BLADE, SHANK AND LOOP ARE BROUGHT SUBSTANTIALLY TO THE REQUIRED SHAPED FOR THE FINISHED ARTICLE WITH A GAP IN THE LOOP ADJACENT THE SHANK WHEREAFTER THE RESULTING FLASH IS REMOVED. 